Spray gun



W. E. RUTH Jan. 30, 1934.

INVENTOR WaHcr E. Rufh SPRAY GUN Filed April 29, 1932 'l' IIIQI'P ATTORNEY s Patented Jan. 30, 1 934 IT'IUNITED STATES PATENT OFFICE.

SPRAY GUN j Walter E. Ruth, Toledo, Ohio, assignor. to Rex Research Corporation, Toledo, Ohio Application April 29, 1932. Serial No. 608,182

' 4 Claims. (01. 29988):..

This invention relates to improvements in spray guns with detachable receptacles. The objects of the invention are, I First, to. provide an improved spray nozzle 5 means of great efficiency and high capacity.

Second, to provide improved means of detachably attaching the receptacle to the spray gun.

Third, to provide such a receptacle which when filled with spray material, such as insecticide, will be refillable only with great difliculty when empty; that is, in efiect non-refillable.

Fourth, to provide an improved detachable connection and arrangement of spray pipes in such a device.

Objects relating to details of construction and operation will appear from the detailed description to follow. The invention is defined in the claims. Preferred embodiments of the invention are illustrated in the accompanying drawing, in which:

Fig. 1 is a side elevation view of the spray gun and receptacle embodying the features of my invention.

Fig. 2 is an enlarged detail longitudinal central f sectional elevation of the structure appearing in Fig. 1, showing the details of substantially all parts, the cap being partially screwed off.

Fig. 3 is an enlarged detail plan view of the flanged nozzle connection for the receptacle, showing the central aperture and the radial slots in said flange.

Fig. 4 is an enlarged detail of construction of the joint for the spray tube and the detachable connection between the spray gun part and the receptacle part.

Fig. 5 is a detail sectional view through the cap and nozzle and adjacent parts, of a modified form.

The parts will be identified by their numerals of reference, which are the same in all the views.

1 is the receptacle. 2 is the usual form of cylinder piston spray gun, with discharge aperture 9. 3 is the screw-threaded nozzle on the can. 4 is the screw cap secured to the under side of the dischargeportion of the spray gun. The nozzle 3 is provided with a flange 31, apertured at the center and notched radially at 32 and each segment turned slightly downward at 33 (see Fig. 3).

6 is the plug with expanded bottom for insertion in the. central aperture of the flange 31. It is provided with a section of tube 5 secured centrally thereto, which tube is somewhat like a funnel at its upper end. The upper end is flanged and seamed at 51 to embrace the central aperture of said cap 6. Preferably an eyeletlike finishing part 7 is inserted and spun into the funnel-like upper end of the tube 5. This joint can be made otherwise, as by a drive fit of the parts or bysoldering. Y

Secured to the end of the spray gun is the sec tion 8 of suction pipe therefor, terminating in a conical bevel at its lower end of about 60 degrees. The upper end is opposite the discharge aperture 9 and the sides are beveled conically at about 60 degrees. The conically pointed pipe end is slightly below the axial center line of the air jet from the gun. A vent aperture 11 is formed around the tube section 8. A well or depression 12 is formed in the bottom .of. the receptacle or can around the lower end of the tube 5.

In usethe cans are filled through the central aperture in the flange 31. The tube sections 5 with plugs 6 are then put in place and forced downward and as they are slightly bulging at the bottom they snap into place somewhat like Hi, the head of a glove fastener. However, the en- W gagement is so rigid that when once snapped into place the plug cannot be removed without extraordinary efiort. Thus when the can is once filled and the cover cap (not shown) is turned down on the can nozzle for shipment, the tube will thus be irremovably inserted into the can ready for use. When the shipping cap is removed the gun may be screwed to place as indicated (partially shown) in Fig. 2. Of course, it is not necessary to rely on the cap to force the tube to place, as it 1 can be forced or driven home.

In Fig. 5 modifications are shown in which corresponding parts are numbered with a prime. The tube section 8' terminates in a funnel-shaped bottomend 32 which fits upon a conical seat on the upper end of the tube section 5. The nozzle 3' is soldered to the top of the can and a perforation 62 slotted like the flange of the nozzle 3, receives the plug 6. The tube section 5 is a drive fit in the center of the plug, the joint being further soldered tight. Tapered compressible springs 13 are secured to the tube section 5' and snap into place, making the plug and tube irremovable, thus making the package substantially 9 non-refillable.

It is clear from what has been said that the tube 5 may be secured to the plug in any suitable way, or the plug part might be spun onto the end of the tube under certain circumstances. These parts may be formed integral or separate. The spray gun may be of any form but the particular form illustrated is very desirable and effective.

I desire to claim the invention specifically in 1 the preferred form illustrated and also broadly, as pointed out in the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. The combination of a cylinder piston spray gun having a discharge aperture and a detachable receptacle, a screw-threaded nozzle on the receptacle having a top flange with a central aperture and radial slots extending therefrom, whereby the sides of the aperture are yielding, and a corresponding screw-threaded cap on the spray gun, a flanged plug having an expanded bottom inserted and secured in said aperture, a divided spray tube, the upper end section having conical ends, carried by the gun and with top end positioned opposite the discharge aperture of the gun, the lower section part of the tube being secured to said plug and fitted by cone and cup joint to the lower end of the upper section of the tube, and a well or depression in the bottom of the receptacle for the lower end of the tube.

-2. The combination of a cylinder piston spray gun having a discharge aperture and a detachable receptacle, a screw-threaded nozzle on the receptacle having a top flange with a central aperture and radial slots extending therefrom, whereby the sides of the aperture are yielding, and a corresponding screw-threaded cap on the spray gun, a flanged plug having an expanded bottom inserted and secured in said aperture, a divided spray tube, the upper end section having conical ends, carried by the gun and with top end positioned opposite the discharge aperture of the gun, the'lower section part of the tube being secured to said plug and fitted by cone and cup joint to the lower end of the upper section of the tube.

3. The combination of a cylinder piston spray gun having a discharge aperture and a detachable receptacle, a screw threaded nozzle on the receptacle having a top flange with a central aperture and radial slots extending therefrom whereby the sides of the aperture are yielding, and a correspondingly screw threaded cap on the spray gun secured onto said nozzle with a detachable joint, a flanged plug having an expanded bottom inserted and secured in said aperture, and a divided spray tube, the upper end section hav ing conical ends, carried by the gun and with its top end positioned opposite the discharge aperture of the gun, the lower section part of the tube being secured to said plug and fitted by cone and cup joint to the lower end of the upper section of the tube.

4. The combination of a cylinder piston spray gun having a discharge aperture and a detacli5 able receptacle, a screw threaded nozzle on the receptacle having a top flange with a central aperture and radial slots extending therefrom, whereby the sides of the aperture are yielding, and a correspondingly screw threaded cap on the spray gun secured onto said nozzle witha detachable joint, a flanged plug having an expanded bottom inserted and secured in said aperture, and a divided spray tube, the upper end section carried by the gun and with its top end positioned opposite the discharge aperture of the gun, the lower section part of the tube being secured to said plug and fitted by cone and cup joint to the lower end of the upper section of the tube,

WALTER E. RUTH.'

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